Development and Prevention of Traumatic Diseases due to a Metallic Foreign Body in the Reticulum of Dairy Cows

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  • KATO YASUHIRO
    Chousei Veterinary Clinical Center, Chiba Prefccture Federation of Agricultural Mutual Aid Association
  • YAMAMOTO HIROMU
    Chousei Veterinary Clinical Center, Chiba Prefccture Federation of Agricultural Mutual Aid Association

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Other Title
  • 乳牛の第二胃内の金属異物による創傷性疾患の発生と予防法
  • 乳牛の第2胃内の金属異物による創傷性疾患の発生と予防法
  • ニュウギュウ ノ ダイ2 イナイ ノ キンゾク イブツ ニ ヨル ソウショウセ

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Abstract

Traumatic diseases caused by metallic objects in the reticulum have recentey showed an increasing tendency. With the view of finding out the cause and thereby applied preventive methods, 193 (1986) and 194 heads (1987) ill dairy cows were subjected to the cow sucker treatment and examined for metallic foreign bodies from January 1986 to December 1987. 62 heads of dairy cows having healthy, normal clinical findings were also identically examined. As a result, metallic foreign bodies were extracted from 80% of the ill cows in the years 1986 and 1987 compared to 82.3% from healthy cows of the same period. However, those metallic foreign bodies which were extracted in 1987 showed significant (p<0.01) increases in both the length and the number compared with those extracted in 1986. Subsequent examination of the suspected food and its mixture led to the detection of a long, linear wire of equal diameter as the intragastric body, from imported, packaged hay. Another examination of 8 cases of dead cows given Parnet 8 (hereinafter referred to as P8) revealed that abundant metallic foreign bodies, which were wires shorter than those found in P8 (8 cm), were adsorbed by P8 in 6 cases. Then, an investigational test was carried out. Judging from the number of extracted metallic foreign bodies, the effect of P8 administration was recognized. In the magnetic force test, an extreme decrease in magnetic force was noted according to the condition (abundant adsorption of wire, two adsorbed by P8), suggesting instable fixation of the foreign body. The above suggested that the wire existing within the imported hay was responsible for the increase in reticulum-originated traumatic diseases, thus making it necessary to detect a group of riskful cows and eliminate intragastric metallic foreign bodies.

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